package servlet;

import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;
import util.Page;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet(urlPatterns = {"/list"})//一个类只能响应一个请求
public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //创建业务层对象 多态
        UserService userService = new UserServiceImpl();
        //封装
        req.setCharacterEncoding("UTF-8");
        String action = req.getParameter("action");
        if("list".equals(action)){
            String dname = req.getParameter("dname");
            String pass = req.getParameter("pass");
            String currentPage = req.getParameter("currentPage");
            if(currentPage==null){
                currentPage="1";
            }
            int int_currentPage = Integer.parseInt(currentPage);
            Page page = new Page();
            User condition = new User(dname,pass);
            //查询总记录数
           int totalCount= UserService.count(condition);
           //
           page.setTotalCount(totalCount);
           page.setCurrentPage(int_currentPage);
           page.setPageSize(10);
           page.setTotalPage();

            //偏移量
            int offset= (int_currentPage-1)*page.getPageSize();

            List<User> users = userService.findAll(condition,offset,page.getPageSize());
            req.setAttribute("users", users);
            req.setAttribute("condition", condition);
            req.getRequestDispatcher("/list.jsp").forward(req, resp);

        }else if("add".equals(action)){
            String dname = req.getParameter("dname");
            String pass = req.getParameter("pass");
            int result = userService.addUser(new User(dname,pass));
            if(result>0){
                //重定向到查询页面
                resp.sendRedirect("user?action=list");//user还是users？
            }else{
                resp.sendRedirect("addUser.jsp");
            }
        }else if("delete".equals(action)){
            String sid = req.getParameter("id");
            Integer id=Integer.parseInt(sid);
            //根据id查询用户信息
            int result = userService.deleteUserById(id);
            if (result>0){
                resp.sendRedirect("user?action=list");
            }


        }else if("toupdate".equals(action)){
            String sid = req.getParameter("id");
            Integer id=Integer.parseInt(sid);
            //根据id查询用户信息

            User user=userService.findById(id);
            //将对象存储在作用域中
            req.setAttribute("user",user);
            req.getRequestDispatcher("/update.jsp").forward(req,resp);//跳转到更新页面
        } else if("update".equals(action)){
            String sid = req.getParameter("id");
            Integer id=Integer.parseInt(sid);
            String dname = req.getParameter("dname");
            String pass = req.getParameter("pass");
            //

            int result = userService.updateUser(new User(id,dname,pass));
            if(result>0){
                //重定向到查询页面
                resp.sendRedirect("user?action=list");//user还是users？
            }else{
                resp.sendRedirect("addUser.jsp");
            }
        }




    }
}
